Great information @Handstitched. When doing shows, etc. we also bought a 12 volt Marine battery and connected a power inverter and charger to prevent having to "purchase" power at the venues. Cost was around $200, but some of the venues charged as much as $50 a show. We ran sewing machines using it. I am no electrician, but was simple enough to make and strap onto a lightweight, fold up dolly. Kind of like having a generator without having to refuel or make a bunch of noise. Also usable in inside markets.